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of the bombings at the boston marathon. joining us now by phone is retired atf agent in charge jim cavenaugh. now with all the security precaution that's are put in place at events like these, why weren't these bombs detected? what went wrong? >> looks like the boston police swept the area with the bomb-sniffing dogs and bomb squad but they did not totally secure the area after they swept it. and that can be for a lot of reasons. issues, whether they suspected anything that would happen. a marathon is a very difficult thing to secure anyway just because of the length of the race and number of people. >> now we've since learned that the explosives were most likely pressure cooker bombs. how sophisticated are those bombs and what do they tell us if anything about the bomber? >> well, what's come out right is they're pressure cookers and ball bearings inside and circuit board. so we know it's electrically fused. one thing we know for sure is they're simple and they're very effective. the electrical fusing remains to be seen is that a cell phone circuit board or a timer? if it's a cell phone, the 12
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